PID sensor

Abstract

The invention discloses a PID sensor, and relates to the technical field of gas sensors, the PID sensor comprises a top cover assembly, an electrode plate, a housing, an ultraviolet lamp, a first electrode, a ceramic tube, a second electrode and a circuit board which are arranged in a split manner, the top cover assembly is buckled on the top of the housing, and the electrode plate is embedded in the top cover assembly and is used for sampling a detected gas; the ultraviolet lamp is arranged in the shell and is used for ionizing the detected gas; the ceramic tube is embedded in the shell, the two sides of the ceramic tube are sleeved with the first electrode and the second electrode respectively, an electric field is formed between the first electrode and the second electrode, the circuit board is arranged at the bottom of the shell, and an air outlet is formed in the bottom of the shell. The split type design is adopted, and disassembly for cleaning, maintenance and the like is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sensors, and in particular to a PID sensor. Background Art

[0002] PID sensor is a photoionization detector, which uses the ultraviolet energy emitted by ultraviolet lamps to make the molecules or atoms in the measured gas absorb energy and ionize. When ultraviolet photons with sufficient energy irradiate the gas molecules, they will knock out the electrons in the gas molecules to form ions and electron pairs, which is the photoionization phenomenon.

[0003] Existing PID sensors are usually of an integrated structure and cannot be disassembled, which makes cleaning and maintenance difficult.

[0004] Therefore, a PID sensor is provided to solve the above problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a PID sensor to solve the problems existing in the above-mentioned prior art, and adopt a split design to facilitate disassembly for cleaning, maintenance, etc.

[0006] To achieve the above object, the present invention provides the following solutions: The present invention provides a PID sensor, comprising a top cover assembly, an electrode sheet, a shell, an ultraviolet lamp, a first electrode, a ceramic tube, a second electrode and a circuit board, wherein the top cover assembly is buckled on the top of the shell, and the electrode sheet is embedded in the top cover assembly for sampling the gas to be measured; the ultraviolet lamp is arranged in the shell for ionizing the gas to be measured; the ceramic tube is embedded in the shell, and the first electrode and the second electrode are respectively sleeved on both sides of the ceramic tube, an electric field is formed between the first electrode and the second electrode, and the circuit board is arranged at the bottom of the shell, and an air outlet is arranged at the bottom of the shell.

[0007] Preferably, the top cover assembly includes an upper cover and an inner cover, the upper cover and the inner cover are buckled on the top of the outer shell, and the upper cover and the inner cover are pressed tightly, and the electrode sheet is embedded between the upper cover and the inner cover.

[0008] Preferably, the electrode sheet is provided with a sampling hole for allowing the measured gas to pass through.

[0009] Preferably, an ion membrane is further included, wherein the ion membrane is arranged between the top cover assembly and the outer shell, and a through hole is arranged on the ion membrane for allowing ultraviolet light to pass through, and the through hole is arranged corresponding to the sampling hole.

[0010] Preferably, the through hole and the sampling hole are both circular holes with a diameter of 2-6 mm.

[0011] Preferably, it further comprises a steel ring, and the ion membrane is embedded in the outer shell through the steel ring.

[0012] Preferably, it further comprises a pump, which is arranged at the rear side of the electrode sheet and is used to provide power for the flow of the gas to be measured; Alternatively, the pump is arranged on the outside of the housing and connected to the air outlet.

[0013] Preferably, it further comprises a glass tube, wherein the glass tube cover is arranged on the outside of the ultraviolet lamp.

[0014] Preferably, the circuit board is a PCB circuit board, and a signal output interface is provided on the PCB circuit board.

[0015] Preferably, an air outlet connector is provided on the air outlet, wherein the air outlet connector is a pagoda connector.

[0016] Compared with the prior art, the present invention has achieved the following technical effects: The PID sensor in the present invention mainly includes a split top cover assembly, an electrode sheet, a housing, an ultraviolet lamp, a first electrode, a ceramic tube, a second electrode and a circuit board, etc., and adopts a split design. Each structure can be disassembled for easy cleaning and maintenance, which is beneficial to prolonging the service life of the PID sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the split structure of the PID sensor in an embodiment of the present invention; Figure 2 This is an overall schematic diagram of a PID sensor in an embodiment of the present invention; Figure 3 Schematic diagram of the bottom of the PID sensor in the embodiment of the present invention.

[0019] In the figure: 1-upper cover, 2-electrode sheet, 3-inner cover, 4-outer shell, 5-ion membrane, 6-steel ring, 7-rubber ring, 8-first electrode, 9-ceramic tube, 10-second electrode, 11-glass tube, 12-circuit board, 13-gas outlet connector, 14-signal output interface, 15-gas outlet. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The purpose of the present invention is to provide a PID sensor to solve the problems existing in the above-mentioned prior art, and adopt a split design to facilitate disassembly for cleaning, maintenance, etc.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Embodiment 1 like Figure 1-Figure 3 As shown, this embodiment provides a PID sensor, which mainly includes a top cover assembly, an electrode sheet 2, a shell 4, an ultraviolet lamp, a first electrode 8, a ceramic tube 9, a second electrode 10 and a circuit board 12, wherein the top cover assembly is buckled on the top of the shell 4, and the electrode sheet 2 is embedded in the top cover assembly for sampling the gas to be measured; the ultraviolet lamp is arranged in the shell 4 for emitting ultraviolet light to ionize the gas to be measured by ultraviolet light; the ceramic tube 9 is embedded in the shell 4, and the first electrode 8 is respectively sleeved on the inner and outer sides of the ceramic tube 9. The first electrode 8 and the second electrode 10 form an electric field between the first electrode 8 and the second electrode 10, so that the ions generated by the ionized gas molecules form a current. One of the first electrode 8 and the second electrode 10 is a positive electrode, and the other is a negative electrode. Both are connected to the circuit board 12 and can transmit the current signal to the circuit board 12. The circuit board 12 is arranged at the bottom of the shell 4, and is used to amplify, filter, convert and other processes the weak electrical signals transmitted from the electrodes, and output them to external equipment; the bottom of the shell 4 is provided with an outlet 15 for exhaust.

[0024] In this embodiment, the PID sensor adopts a split design, and each structure can be disassembled to facilitate cleaning and maintenance, which is beneficial to increasing the service life of the PID sensor.

[0025] In this embodiment, the top cover assembly mainly includes an upper cover 1 and an inner cover 3 which are arranged up and down, the upper cover 1 and the inner cover 3 are buckled on the top of the outer shell 4, and the upper cover 1 and the inner cover 3 are pressed tightly, the electrode sheet 2 is embedded between the upper cover 1 and the inner cover 3, and the electrode sheet 2 can be protected by the upper cover 1 and the inner cover 3; wherein, the upper cover 1 and the inner cover 3 are provided with holes for the measured gas to pass through, the upper cover 1 can be removed, and when the upper cover 1 is disassembled, the PID sensor can still work normally without affecting the measurement.

[0026] In this embodiment, the electrode sheet 2 is provided with a sampling hole for allowing the measured gas to pass through.

[0027] In this embodiment, an ion membrane 5 is also included. The ion membrane 5 is arranged between the top cover assembly and the outer shell 4. A through hole is provided on the ion membrane 5 for allowing ultraviolet light to pass through. The through hole is arranged corresponding to the sampling hole. In this embodiment, the ultraviolet signal is shielded by the ion membrane 5, and the ultraviolet light is focused on the through hole transmission signal of the ion membrane 5, which can remove interference from other ultraviolet bands.

[0028] As a preferred implementation, in this embodiment, the through hole and the sampling hole are both circular holes with a diameter of 2-6 mm, preferably 4 mm.

[0029] In this embodiment, a steel ring 6 is further included, and the ion membrane 5 is embedded in the housing 4 through the steel ring 6 , and the ion membrane 5 can be supported by the steel ring 6 .

[0030] In this embodiment, a pump is also included, and the pump is arranged on the rear side of the electrode sheet 2 to provide power for the flow of the measured gas; wherein the rear side refers to the rear side along the flow direction of the measured gas, that is, when gas collection is performed, the measured gas first enters the electrode sheet 2 and then enters the pump. This method is equivalent to the pump forming a strong airflow behind the electrode sheet 2, and the flow speed of the measured gas will be very fast. The T90 response speed of the pump is very fast, which can reach about 5 seconds.

[0031] Alternatively, the pump may be externally arranged and communicated with the air outlet 15 .

[0032] In this embodiment, the measured gas has good fluidity, so impurities and dust in the measured gas are not easy to stay on the surface of the ultraviolet lamp, and the oxides formed by the ionized gas on the surface of the ultraviolet lamp are not easy to accumulate on the surface of the ultraviolet lamp, so the ultraviolet lamp is not easily contaminated.

[0033] In this embodiment, a rubber ring 7 is further provided on the top of the ceramic tube 9 to facilitate fitting and sealing.

[0034] In this embodiment, a glass tube 11 is further included. The glass tube 11 is covered on the outside of the ultraviolet lamp to protect it and facilitate the propagation of ultraviolet light. The glass tube 11 can be filled with an inert gas such as helium. Further, the glass tube 11 is located in the second electrode 10, and its top can be flush with the ceramic tube 9. When the top cover assembly and the electrode sheet 2 are removed, the top plane of the glass tube 11 can be exposed, which is convenient for observing the ultraviolet lamp inside and scrubbing the top plane of the glass tube 11.

[0035] In this embodiment, the circuit board 12 is a PCB circuit board, and a signal output interface 14 is provided on the PCB circuit board for outputting signals.

[0036] In this embodiment, an air outlet connector 13 is provided on the air outlet 15, wherein the air outlet connector 13 is preferably a pagoda connector.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A PID sensor, characterized in that: It includes a separately arranged top cover assembly, an electrode sheet, an outer shell, an ultraviolet lamp, a first electrode, a ceramic tube, a second electrode and a circuit board, wherein the top cover assembly is buckled on the top of the outer shell, and the electrode sheet is embedded in the top cover assembly for sampling the gas to be measured; the ultraviolet lamp is arranged in the outer shell for ionizing the gas to be measured; the ceramic tube is embedded in the outer shell, and the first electrode and the second electrode are respectively sleeved on both sides of the ceramic tube, an electric field is formed between the first electrode and the second electrode, and the circuit board is arranged at the bottom of the outer shell, and an air outlet is arranged at the bottom of the outer shell.

2. The PID sensor according to claim 1, characterized in that: The top cover assembly comprises an upper cover and an inner cover, wherein the upper cover and the inner cover are buckled on the top of the outer shell, and the upper cover and the inner cover are pressed tightly, and the electrode sheet is embedded between the upper cover and the inner cover.

3. The PID sensor according to claim 1, characterized in that: The electrode sheet is provided with a sampling hole for allowing the measured gas to pass through.

4. The PID sensor according to claim 3, characterized in that: It also includes an ion membrane, which is arranged between the top cover assembly and the shell. The ion membrane is provided with a through hole for allowing ultraviolet light to pass through, and the through hole is arranged corresponding to the sampling hole.

5. The PID sensor according to claim 4, characterized in that: The through hole and the sampling hole are both circular holes with a diameter of 2-6 mm.

6. The PID sensor according to claim 4, characterized in that: It also includes a steel ring, through which the ion membrane is embedded in the shell.

7. The PID sensor according to claim 1, characterized in that: Also includes a pump, the pump is arranged at the rear side of the electrode sheet, and is used to provide power for the flow of the measured gas; Alternatively, the pump is arranged on the outside of the housing and connected to the air outlet.

8. The PID sensor according to claim 1, characterized in that: It also includes a glass tube, and the glass tube cover is arranged on the outer side of the ultraviolet lamp.

9. The PID sensor according to claim 1, characterized in that: The circuit board is a PCB circuit board, and a signal output interface is arranged on the PCB circuit board.

10. The PID sensor according to claim 1, characterized in that: The air outlet is provided with an air outlet connector, wherein the air outlet connector is a pagoda connector.

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